Steam-boiler.



* rrED STATES PATENT MINOTT W. SEWALL, DECEASED, LATE OF NEW YORK, N.Y., BY SUSANN E. SEWALL, EXECUTRIX, OF NEW YORK, N. Y., ASSIGNOR TO THEBABCOOK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEWJERSEY.

STEAM-BOILER.

Specification of Letters mm.

Patented Nov. 30, 1915.

Application filed July 30, 1914. Serial No. 854,156.

T 0 all whom it may concern:

Be it known that MINoT'r W. SEWALL, late a citizen of the United Statesand a resident of the city, county, and State of New York, did inventcertain new and useful Improvements in Steam- Boilers, of which thefollowing is a specification.

This invention relates to steam boilers and more particularly to asystem of tubing, part of which constitutes a water-protected roof forthe furnace of a Stirling boiler.

The inventionwill be understood by reference'to the accompanying drawingwhich is a vertical section partly in outline,-of a Stirling boiler withthe present improvement.

In the drawing the numerals 1, 2 and 3 indicate'the usual uppertransverse stcamand water drums of a Stirling boiler, these drums beingconnected by banks of generating tubes witha lower mud drum 4, all asusual and well-known in this class of boilers.

7 by a row of tubes 10 curved at their lower ends and having a generalupward inclination. The tubes 10 support a bafile 11 extending fromchamber 9 toward the rear of the combustion chamber, said tubes andbafile constitutingthe roof of the furnace chamber. Bafile 11 terminatesshort of the plane of the bridge wall so as to permit the gases toescape into the secondary combustion chamber above the roof and amongthe tubes of the first bank. Any approved system of baffling may beemployed for the generating tubes. The drawing shows the standard baflle12' at the rear of the first bank of tubes'l3.

A series of substantially vertical tubes 14 I connect chamber 9 with thefront steam and water drum 1, thereby permitting a free circulation fromdrum 4: through the sup- 9 and tubes 14 to the front upper drum.

What is claimed and desired to besecured by Letters Patent of the UnitedStates is 1. A water tube boiler having upper transverse steam and waterdrums and a intermediate the levels of the upper and lower drums, tubesconnecting saidsupplcmental drum and chamber, and tubes connecting saidchamber with the front drum.

2. A water tube boiler having upper transverse steam and water drums anda.

lower mud drum, banks of generating tubes connecting said drums, a.supplemental drum located in front of said lower drum,

tubes directly connecting said lower and.

supplemental drums, a transverse water upper chamber intermediate thelevels of the up per and lower drums, tubes connecting. saidsupplemental drum and chamber, a bafle extending from said chamberrearwardly,

said tubes and bafile constituting a roof for the boiler furnace',. -andtubes connecting said chamber with the frontupper drum.

3. A water tube :boilerhaving upper transverse steam andx'wa'ter drumsan lower mud drum, banks of generating tubes connecting said drums, a.supplemental drum located in front of said lowerdrum,

tubes directly connecting said lower and.

su lemental drums a transverse Water chamber intcrmediate'the levels ofthe upper and lower drums and substantially under the front upper drum,tubes connecting said supplemental drum and water chamber-andconstituting a water-protected roof for the furnace, and tubesconnectingsaid chamber with the front upper drum.-

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses. I

, SUSANN E. SEWALL, Emcmltm'm of the estate of Minott W. Sewail,

deceased.

Witnesses:

E. H. WELLS, E. P. TERRY.

